CFLib.org – Common Function Library Project

Rot13(string)

Last updated August 23, 2001

author

Rob Brooks-Bilson

Version: 1 | Requires: CF5 | Library: SecurityLib

Description:
Stands for "rotate alphabet 13 places". Caesar-cypher encryption that replaces each English letter with the one 13 places forward or back along the alphabet. The same function is used to both encrypt and decrypt a string.

Return Values:
Returns a string.

Example:

<CFSET String="Welcome to the Common Function Library Project.">
<CFSET Encrypted = Rot13(String)>
<CFSET Decrypted = Rot13(Encrypted)>

<CFOUTPUT>
<B>Original:</B><BR>
#String#
<P>
<B>Encrypted:</B><BR>
#Encrypted#
<P>
<B>Dencrypted:</B><BR>
#Decrypted#
</CFOUTPUT>

Parameters:

Name Description Required
string String you wish to rot13 encrypt. Yes

Full UDF Source:

/**
 * Caesar-cypher encryption that replaces each English letter with the one 13 places forward or back along the alphabet.
 * 
 * @param string 	 String you wish to rot13 encrypt. 
 * @return Returns a string. 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1.0, August 23, 2001 
 */
function rot13(string)
{
  var i=0;
  var j=0;
  var k=0;
  var out="";
  for (i=1; i LTE Len(String); i=i+1){
    j=Asc(Mid(string, i, 1));
    if(j GTE 65 AND j LTE 90){
      j=((J-52) MOD 26)+65;
    }
    else if(j GTE 97 AND j LTE 122){
      j=((j-84) MOD 26)+97;
    }
    out=out&Chr(j);
  }
  return out;
}
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